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1 | /* |
2 | * Copyright Andrey Semashev 2007 - 2015. | |
3 | * Distributed under the Boost Software License, Version 1.0. | |
4 | * (See accompanying file LICENSE_1_0.txt or copy at | |
5 | * http://www.boost.org/LICENSE_1_0.txt) | |
6 | */ | |
7 | ||
8 | #include <string> | |
9 | #include <fstream> | |
10 | #include <iostream> | |
11 | #include <boost/smart_ptr/shared_ptr.hpp> | |
12 | #include <boost/core/null_deleter.hpp> | |
13 | #include <boost/log/core.hpp> | |
14 | #include <boost/log/expressions.hpp> | |
15 | #include <boost/log/sinks/async_frontend.hpp> | |
16 | #include <boost/log/sinks/text_ostream_backend.hpp> | |
17 | #include <boost/log/sources/severity_channel_logger.hpp> | |
18 | #include <boost/log/sources/record_ostream.hpp> | |
19 | ||
20 | namespace logging = boost::log; | |
21 | namespace src = boost::log::sources; | |
22 | namespace expr = boost::log::expressions; | |
23 | namespace sinks = boost::log::sinks; | |
24 | namespace keywords = boost::log::keywords; | |
25 | ||
26 | //[ example_sinks_async_init | |
27 | enum severity_level | |
28 | { | |
29 | normal, | |
30 | warning, | |
31 | error | |
32 | }; | |
33 | ||
34 | // Complete sink type | |
35 | typedef sinks::asynchronous_sink< sinks::text_ostream_backend > sink_t; | |
36 | ||
37 | boost::shared_ptr< sink_t > init_logging() | |
38 | { | |
39 | boost::shared_ptr< logging::core > core = logging::core::get(); | |
40 | ||
41 | // Create a backend and initialize it with a stream | |
42 | boost::shared_ptr< sinks::text_ostream_backend > backend = | |
43 | boost::make_shared< sinks::text_ostream_backend >(); | |
44 | backend->add_stream( | |
45 | boost::shared_ptr< std::ostream >(&std::clog, boost::null_deleter())); | |
46 | ||
47 | // Wrap it into the frontend and register in the core | |
48 | boost::shared_ptr< sink_t > sink(new sink_t(backend)); | |
49 | core->add_sink(sink); | |
50 | ||
51 | // You can manage filtering and formatting through the sink interface | |
52 | sink->set_filter(expr::attr< severity_level >("Severity") >= warning); | |
53 | sink->set_formatter | |
54 | ( | |
55 | expr::stream | |
56 | << "Level: " << expr::attr< severity_level >("Severity") | |
57 | << " Message: " << expr::message | |
58 | ); | |
59 | ||
60 | // You can also manage backend in a thread-safe manner | |
61 | { | |
62 | sink_t::locked_backend_ptr p = sink->locked_backend(); | |
63 | p->add_stream(boost::make_shared< std::ofstream >("sample.log")); | |
64 | } // the backend gets released here | |
65 | ||
66 | return sink; | |
67 | } | |
68 | //] | |
69 | ||
70 | //[ example_sinks_async_stop | |
71 | void stop_logging(boost::shared_ptr< sink_t >& sink) | |
72 | { | |
73 | boost::shared_ptr< logging::core > core = logging::core::get(); | |
74 | ||
75 | // Remove the sink from the core, so that no records are passed to it | |
76 | core->remove_sink(sink); | |
77 | ||
78 | // Break the feeding loop | |
79 | sink->stop(); | |
80 | ||
81 | // Flush all log records that may have left buffered | |
82 | sink->flush(); | |
83 | ||
84 | sink.reset(); | |
85 | } | |
86 | //] | |
87 | ||
88 | int main(int, char*[]) | |
89 | { | |
90 | boost::shared_ptr< sink_t > sink = init_logging(); | |
91 | ||
92 | src::severity_channel_logger< severity_level > lg(keywords::channel = "net"); | |
93 | BOOST_LOG_SEV(lg, warning) << "Hello world!"; | |
94 | ||
95 | stop_logging(sink); | |
96 | ||
97 | return 0; | |
98 | } |